Fyldte Aeg med Stenbiderrogn

There is a moment in late January when the fishmongers in Copenhagen put up small handwritten signs. _Stenbiderrogn._ The lumpfish are running. From January through April, along the coasts of Jutland and Bornholm and out into the Kattegat, the female lumpfish, the stenbider, comes inshore heavy with her eggs. The boats go out before dawn and come back with crates of dark, glistening pearls, and for those few months Danish kitchens reorganise themselves around the season's most quietly celebrated ingredient.

Fyldte aeg med stenbiderrogn is one of the simplest things you can do with the roe, and that's the point. A boiled egg, a spoon of cold creme fraiche, a generous mound of pearls, a few specks of finely chopped red onion, a frond of dill. There is nowhere for anything to hide. The egg has to be cooked exactly right, the creme fraiche has to be thick and clean-tasting, and the roe has to be fresh enough that each pearl bursts separately on the tongue. When all three meet, you understand why Danes wait for this season with the joy of waiting.

This is appetiser food for a celebration, a New Year lunch, a confirmation, a dinner where someone is being welcomed at the table. It belongs at the start of the meal, before the herring, before anything richer takes over. Pay attention to two things as you cook: the nine-minute boil that gives you a yolk just set and never chalky, and the gentle hand with the roe at the end. Spoon the pearls, never smear them. You'll know when it's right because the eggs will look like small jewels on the plate, and that's exactly what they are.